Cycle Time Calculation - Moxa Technologies ioThinx 4530 Series User Manual

The controller's cycle time is defined as how much time the CPU needs to poll the status of all IO modules.
This information is important since it allows users to make sure the controller can control their application
within a designated time period. The cycle time calculation is based on the following table. A cycle time is
calculated for each group of eight appended 45M modules. The cycle time of a group is the sum of the cycle
time of the first module in the group (the times in column 1) plus the cycle times of the 2nd through 8th
modules (the times in column 2) in the group. To calculate the cycle time of ioThinx 4530 Series CPU,
simply add up the cycle times of all of the groups connected to the ioThinx, and then round the time up to
the nearest millisecond.
Cycle time as 1st module in one
group (µs)
45MR-1600
45MR-1601
45MR-2404
45MR-2600
45MR-2601
45MR-2606
45MR-3800
45MR-3810
45MR-6600
45MR-6810
We provide two examples to illustrate cycle time calculations.
Case 1. 4-piece 45MR-1600 and 4-piece 45MR-2601.
In this case, the eight modules form one group. The cycle time of this combination is 1900 µs = 1200 µs +
7 x 100 µs. The ioThinx 4530 Series will round up the cycle time to the ms level, and consequently the cycle
time of this combination is 2 ms.

Cycle Time Calculation

A.
1200
1200
1300
1200
1200
1200
1300
1300
1500
1500
Cycle time as 2nd to 8th module of the one
group (µs)
A
100
100
100
100
100
100
200
200
300
300